package src.Sixteen;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

public class InternetContentFrame1 extends JFrame {

    private  JTextArea ta_content;
    private  JTextField tf_address;
    /**
     * Launch the application
     */

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    InternetContentFrame1 frame=new InternetContentFrame1();
                    frame.setVisible(true);

                }catch (Exception e){
                    e.printStackTrace();
                }
            }
        });
    }
    /**
     * create the frame
     */
    public  InternetContentFrame1(){
        super();
        setTitle("解析网页中的内容");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


        final  JPanel panel=new JPanel();
        getContentPane().add(panel,BorderLayout.NORTH);


        final JLabel label=new JLabel();
        label.setText("输入网址：");
        panel.add(label);

        tf_address=new JTextField();
        tf_address.setPreferredSize(new Dimension(260,25));
        panel.add(tf_address);

        final JButton button=new JButton();
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed( final ActionEvent e) {
                String  address=tf_address.getText().trim(); //获得输入网址
                Collection urlCollection=getURLCollection(address); //调用方法，获得网页内容的集合对象
                Iterator it=urlCollection.iterator(); //获得集合的迭代器对象
                while (it.hasNext()){
                    ta_content.append((String)it.next()+"\n"); //在文本域中显示解析的内容
                }


            }
        });
        button.setText("解析网页");
        panel.add(button);

        final  JScrollPane scrollPane=new JScrollPane();
        getContentPane().add(scrollPane,BorderLayout.CENTER);

        ta_content=new JTextArea();
        ta_content.setFont(new Font("",Font.BOLD,14));
        scrollPane.setViewportView(ta_content);
    }
    public  Collection<String >getURLCollection(String  urlString){
        URL url=null; //声明URL
        URLConnection conn=null; //声明URLConnection
        Collection<String >urlCollection=new ArrayList<String>(); //创建集合对象
        try {
            url=new URL(urlString);  //创建URl对象
            conn=url.openConnection(); //获得连接对象
            conn.connect();    //打开到url引用资源的通信链接
            InputStream is=conn.getInputStream();  //获取流对象
            InputStreamReader in=new InputStreamReader(is,"UTF-8"); //转换为字符流
            BufferedReader br=new BufferedReader(in); //创建缓冲流对象
            String  nextline=br.readLine();  //读取信息，解析网页
            while (nextline!=null){
                urlCollection.add(nextline); //解析网页的全部信息，添加到集合中
                nextline=br.readLine(); //读取信息，解析网页


            }



        }catch (Exception e){
            e.printStackTrace();
        }

        return  urlCollection;


    }
}